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Polyester resin for high leveling powder coating and preparation method and application thereof

A powder coating, polyester resin technology, applied in powder coatings, polyester coatings, epoxy resin coatings, etc., can solve the problems of short gelation time, high softening point and high temperature melt viscosity of polyester resin, and high dosage.

Active Publication Date: 2019-01-15
安徽恒隆新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 60 / 40 hybrid powder coating is a powder coating widely used indoors. It usually needs to use polyester resin and E-12 epoxy resin for cross-linking and curing to form a film, while conventional 60 / 40 polyester is commonly used for trimellitic anhydride or The end-capping of pyromellitic dianhydride makes the activity of the carboxyl group in the final polyester very high and the gelation time is short; at the same time, due to the large amount of terephthalic acid and isophthalic acid in the molecular structure, the polyester resin The softening point and high-temperature melt viscosity are relatively large, which also leads to insufficient leveling on the surface of the final coating film, making it difficult to obtain a high-leveling coating film

Method used

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  • Polyester resin for high leveling powder coating and preparation method and application thereof
  • Polyester resin for high leveling powder coating and preparation method and application thereof
  • Polyester resin for high leveling powder coating and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The polyester resin for high-leveling powder coatings described in this embodiment, based on the total amount of raw materials for preparing the polyester resin, includes the following raw material components in molar percentages:

[0027]

[0028]

[0029] The method for preparing the described high-leveling powder coating polyester resin described in the present embodiment may further comprise the steps:

[0030] (1) Mix the D-panthenol, neopentyl glycol, glyceryl oleate, and 3-glycidyl etheroxypropyl triethoxysilane in the prescribed amount, and control the temperature below 125°C for heating melting

[0031] (2) Add the terephthalic acid, 4-oxo-1,4-dihydro-2,6-pyridinedicarboxylic acid and hydroquinone-O,O'-diacetic acid in the formula amount to the above mixed material, At the same time, add the catalyst in the formula amount, and gradually raise the temperature to react under the protection of nitrogen until no obvious distillate is distilled out, and the a...

Embodiment 2

[0036] The polyester resin for high-leveling powder coatings described in this embodiment, based on the total amount of raw materials for preparing the polyester resin, includes the following raw material components in molar percentages:

[0037]

[0038]

[0039] The method for preparing the polyester resin for high leveling powder coatings described in this embodiment is the same as that in Example 1.

[0040] After testing, the polyester resin prepared in this example has an acid value of 51 mgKOH / g, a softening point of 102° C., and a melt viscosity (200° C.) of 3570 mPa·s.

Embodiment 3

[0042] The polyester resin for high-leveling powder coatings described in this embodiment, based on the total amount of raw materials for preparing the polyester resin, includes the following raw material components in molar percentages:

[0043]

[0044]

[0045] The method for preparing the polyester resin for high leveling powder coatings described in this embodiment is the same as that in Example 1.

[0046] After testing, the polyester resin prepared in this example has an acid value of 50 mgKOH / g, a softening point of 95° C., and a melt viscosity (200° C.) of 3150 mPa·s.

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Abstract

The invention belongs to the technical field of powder coatings, in particular to polyester resin for a high leveling powder coating, and further discloses a preparation method thereof and applicationthereof in preparing a 60 / 40 mixed powder coating. The polyester resin for the high leveling powder coating is prepped by polymerization of terephthalic acid, 4-oxo-1,4-dihydro-2,6-pyridine dicarboxylic acid, hydroquinone-O, O'-diacetic acid, D-Panthenol, neopentyl glycol, Glyceryl behenate, 3-glycidoxypropyl triethoxysilane and Carbic anhydride as raw materials. It is determined that the obtained polyester resin has a low melt viscosity at high temperature (200 DEG C), good fluidity, and long gelation time, ensures sufficient leveling time and contributes to obtaining a high leveling grade coated plate surface.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, in particular to a polyester resin for high leveling powder coatings, and further discloses its preparation method and its application for preparing 60 / 40 mixed powder coatings. Background technique [0002] Powder coating is a 100% solid powder that does not contain organic solvents. It is different from oil-based paints and water-based paints. It does not use solvent or water as a dispersion medium when coating, but uses air as a dispersion medium to evenly coat the workpiece. The surface is a new type of environmentally friendly paint that forms a special-purpose coating film after heating. Powder coating has the advantages of no VOC, environmental protection, energy saving, high construction efficiency and wide application range. With its advantages of economy, environmental protection, high efficiency and excellent performance, it is gradually replacing organic solvent-based coatings...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/685C08G63/85C08G63/91C09D5/03C09D167/00C09D163/00
CPCC08G63/6854C08G63/85C08G63/914C09D5/03C09D167/00C08L63/00
Inventor 叶新栋鲍观良王永垒
Owner 安徽恒隆新材料有限公司
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